Fabriken



amidohenzhydrol are license.

FABRIKEN,

FR. BAYER re 00,. on sun; PLACE.

TRiPi-i ENYLMETHANE DYE.

SPECIFIC. A'JIION forming part of Letters'Patent No. 476,414, dated June 7, 1892.

Application filerlDeccmhez' 13,1891. Serial No. 415,517- (3 England September 16,

pecimens.) Patented in 1590,190. 14,621, and in France September Grmany August 29 1890, No. 58,483;

To all whom it may concern:

hie

residing m, 5 m

Series of the T i, FRIEDRICH RUNKEL, chemist, (assignor to the census FR. BAYER & ubject of the Emperor of ld, Germany,

and useful Improvementoi Coloring'lllatters' beriphenylmethnne' h the aforesaid FARBEN- FABRIKEN has alread y obtained Letters Pal:-

ent in the following No. 58,483, dated r'i'ug'ust 22,

countries: in Germany,

1890; in England,

No. 14,821, dated September 16, 1890, a m] in 1 rnn'ce,No.208,53 ,dnted'Se 'geniber 15-), 1.890,)

of which the My in vention relol.

follow ng is n-specificaiion.

es to the production of a new valuable trif l enylmethnne dye-stuff by combining equal m icirnincthyldinm idoho acid in the rescneeo acid and by subsequ produced leuco compound,

to the formula -lecnlnr proportions of nzhydrol and salicylic f concentrated sulphuric ently oxidizing the firstwhich corresponds exc i n.

o o inmoig),

l n our on coon into the dye-stud by meansof oxidizing seer ts.

The following is a.

lion of the process for oring-mattcr:

clear and exact descripproducing my new collwenty kilos, by weight, of tetrnmethylditen kilos, by Weight,

thoroughly mixed with of salicylic-acid and the obtained mixture is slowly and on slirringin- (reduced into one hundred sigd t 40 by weight, of conccntrnt 06 Bonnie,

inking enrelhnt the \"vfen'ry'kilos, ed sulphuric acid at Tempe-rm does not rise above it) centigrndc during the whole operation.

poured'on one hund-i weight-,of ice and two hundred are mixed therewith.

5 ,nt lirs'c yellow, has whole mass is ed and twenty kilos, by kilos of water Then soda-lye is added until an almost neutral reaction is obtained.

By means of n eonccn trnled. watery sol u l ion of sodium acetate theleuco compound is precipi- .tated. The precipitated lenco compound,

onrficoon. It is filtered off, washed out, pressed, and dried at a Temperature not rising above 7 O centigra-de. kilos, by weight, of the lastnnmed lcuco com pound (are dissolved on heating in a mixture of one hundred. and twenty kilos, by weight, of an acetic-acid solution containing fifty percent. of pure acetic ac d and twenty-two kilos, by Weight, of inuriatic acid of 1.15 specific gravity. After the'solution has cooled to 10 ccntigrnde, 47.7 kilos, by weight, of n. lend dioxide paste containing 5 thirty per cent. of lead dioxide are introduced on stirring. The oxidation immediately takes place and heating; is not necessary. By adding a solution'of one kilo, by Weight, of concentrated sulphuric acid at 66 Bauin in seventylitersof wnterthc lead dissolvedis perfectly precipitated in the form of loud sulphate,\vliich after several hours is filtered off.

.The resulting solution is immediately mixed with continuous stirring, adding ice, with so much dilute sodarlye as is necessary for ncutralizing' the mineral ucids'nnd a, part of the accticncid, the fluid containing still a. small quantity of the latter free acid, The .dye-

stuff formed by the oxidation of the llHliVO- "mentioned-deuce comgioui'ul, and. corresponding to the following, formula,

(fi,,ll ,ii{ll1il,,l o o n .wi- ,Ol-I

Oil ,,ll,, (ll'i()ll,

sepsrntes as a dnrl-z lisliy precipitate, which filtered oil, washed out, and employed for dye roe brownliquid results.

acid is gradually added to the liquid, at first a bluish-green, then a reddish-brown color is produced, and the latter reddish-brown liquid,-

whenpoured in to a great excess of water,again at uni-3.; reenish color. It dissolves 1n alcohol easily and with reddish-violet colon,

By concentrated sulphuric acid it is dissolved with brownish-yellow color, which is changed into yellowish red by the addition of ice. \Vhen this sulphuric-acid solution is further mixed with agreat quantity of water,a light- Out of its solutions-in dilute mineral acids it is again separated by the addition of sodium acetate. treated with reducing agents, it is converted into the above-mentioned leuco compound, which again yields the dye-stulf by oxidation. It is capable of dyeing in acetic-acid baths wool, silk, and. cotton when these are previously mordanted with chromium salts, and for printing cotton goods. In the last. case a paste containing the coloring-matter mixed with chromium acetate and one of the usual thickenings must be employed. It produces reddish-violet shades perfectly fast to sea pi n g.

.ll'aving thus described my invention and in what manner it can be performed, that which I claim as new. and desire to soon re by Letters l. The process of producing a new val uable triphenylmethane dye-stud by combining in subsequently oxidizing the resulting leuco compound, substantially as described.

2. The coloring-matter which has the formula,

and which in a'dried and pulverized state forms an olive-colored powder which difhcultly dissolves} in water, sodium carbonate, and am monia liq hid with violet color, somewhat more easily in soda-lye with the same color, and when mixed with water and dilute hydrochloric acid is gradually added to the liquid at first a bluisli-grecn,then a reddishbrown color is produced, which when poured into a great excess of water gives a green liquid; also, dissolves easily with reddish-violet color in alcohol, and by concentrated sulphuric acid is dissolved with brownislnyel low color, changing into yellowish red by cooling, and mixing with a great quantity of water assumes a light-brown color; out of dilute-acid solutions it is separated by't-he addition of sodium acetate, and by reducing agents it is converted into the corresponding leuco tompound, which again is oxidizable into ihe lyestud, from which the reddish-violet shades produced are totally fast to soaping.

In testimony whereof I have signed my name in the presence of twosnbscribing wit nesses.

FRIEDRICH RUN-Kit? \V i l n csses:

WM. ESSEN\\'E1N, RUnoLru menu It is hereby certified that in Letters Patent No. 476,414, granted June 7, 1892, upon the application of Ft-iedri'oh Runke}, of Elberfeld, Germany, for an'improvement in Triphenylmethene Dyes, an error appem's in the printed specification requiring the follewing correction, viz.: In line 6 page 2, the worll cooling should be stricken out and the words the addition'of ice be'insert ed instead; and thatthe said Letters Patent should be read with'this correetion therein that the same may conform to the record of the ease in the Patent ()ffice.

Signed, countersigned. and. sealed this 28th day of June, A D. 1892.

GEO. CHANDLER, First Assistant Secretary of the Interior.

[SEAL.]

Uountursigned W. E. SIMONDS,

Gown-issioner of Patents. 

